C# 如何在派生类中委托方法

[yilezhuo1894]

C# 小白,一个项目中遇到的问题:
这个例子是关于从派生类中调用的实现,虽然没实现.一个 进度条,一个 标签 ,一个按钮,完整(错误)例子如下

窗体:

System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.Threading;

namespace WindowsFormsApplication1
{
    public partial class Form1 : Form
    {
        delegate void AsynUpdateUI(int step);

        public Form1()
        {
            InitializeComponent();
        }

        private void btnWrite_Click(object sender, EventArgs e)
        {
            int taskCount = 10000; //任务量为10000
            this.pgbWrite.Maximum = taskCount;
            this.pgbWrite.Value = 0;

            w2 dataWrite = new w2();//实例化一个写入数据的类
            dataWrite.UpdateUIDelegate += UpdataUIStatus;//**绑定更新任务状态的委托
            dataWrite.TaskCallBack += Accomplish;//**绑定完成任务要调用的委托

            //启动线程
            //Thread thread = new Thread(new ParameterizedThreadStart(dataWrite.Write));
            Thread thread = new Thread(new ParameterizedThreadStart(dataWrite.Write));
            thread.IsBackground = true;
            thread.Start(taskCount);
        }

        //更新UI
        private void UpdataUIStatus(int step)
        {
            if (InvokeRequired)
            {
                this.Invoke(new AsynUpdateUI(delegate(int s)
                {
                    this.pgbWrite.Value += s;
                    this.lblWriteStatus.Text = this.pgbWrite.Value.ToString() + "/" + this.pgbWrite.Maximum.ToString();
                }), step);
            }
            else
            {
                this.pgbWrite.Value += step;
                this.lblWriteStatus.Text = this.pgbWrite.Value.ToString() + "/" + this.pgbWrite.Maximum.ToString();
            }
        }

        //完成任务时需要调用
        private void Accomplish()
        {
            //还可以进行其他的一些完任务完成之后的逻辑处理
            MessageBox.Show("任务完成");
        }

    }
}

父类:

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.IO;

namespace WindowsFormsApplication1
{
    public class DataWrite
    {
        protected virtual void Write(object lineCount)
        {

        }
    }
}

子类 w2:

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.IO;

namespace WindowsFormsApplication1
{
    class w2 : DataWrite
    {
        public delegate void UpdateUI(int step);//声明一个更新主线程的委托
        public UpdateUI UpdateUIDelegate;

        public delegate void AccomplishTask();//声明一个在完成任务时通知主线程的委托
        public AccomplishTask TaskCallBack;

        protected override void Write(object lineCount)
        {
            StreamWriter writeIO = new StreamWriter("text.txt", false, Encoding.GetEncoding("gb2312"));
            string head = "编号,省,市";
            writeIO.Write(head);
            for (int i = 0; i < (int)lineCount; i++)
            {
                writeIO.WriteLine(i.ToString() + ",湖南,衡阳");
                //写入一条数据，调用更新主线程ui状态的委托
                UpdateUIDelegate(1);
            }
            //任务完成时通知主线程作出相应的处理
            TaskCallBack();
            writeIO.Close();
        }
    }
}

主要的问题是实现 从 w2 中通过委托调用 form 的方法,琢磨了一下午,希望高手赐教,谢谢

[无情时尚]

protected virtual void Write(object lineCount) 
改
 public virtual void Write(object lineCount)

class w2 : DataWrite
改
public class w2:DataWrite

protected override void Write(object lineCount)
改
public override void Write(object lineCount)

[白衣如花]

委托能用 += 吗。。。我忘记了额，但是看代码貌似没问题

[yilezhuo1894]

引用 1 楼 yuhijk2055 的回复:

protected virtual void Write(object lineCount) 
改
 public virtual void Write(object lineCount)

class w2 : DataWrite
改
public class w2:DataWrite

protected override void Write(object lineCount)
改
public override void Write(object lineCount)

感谢帮助,问题解决了, 不过还想问一下 1\如果是 internal class 能否用? 比如 internal class NativeSessionTask : NetworkTask internal class NetworkTask 这样的 2\还有是否只在线程中有用?本来这个试一下也能知道. 见笑了,基础知识不足